Coiling.



A. MCIVIURT'RIE.

COILING.

APPucATxoN FILED ocT.1, |910.

Patented May 2, 1916.

www

, UNITED STATES PArENT orrior..

Anzug .,noxunrmn, or NEW YoRK,-N. Y., AssIGNon To Tiroir/ras` a Barre COMPANY, ow'NEW YORK, N. Y., n CORPORATION or NEW YORK comme.

f contemplate the any field to' which they are adapted by their Beit kno-Wn that I, ADNAH MoMURrnin,

of New York, N. Y., have invented certain Improvements in Coiling, of which the following description, in connection with the accompanying drawings, is a specification,

like references on the drawings designating like parts.

rlrhis invention relates to coiling, and is of particular utility when employed in apparatus for manufacture of the helically coiled metal strip used asa protective armor sheath for `such articlesy as hose pipes and insulated electrical conductbifs, although l use of my improvements in nature.

An important object of my invention is -to provide a method oft producing a more gradual helical deformation of thesome- What resilient metal strip of Which such -sheaths'are usually formed,vthan has been j vcustomary in ceiling such articles heretovolutions .that of the'nished tube, and thereafter reduc'ing gradually but steadily, Without unfore,I and `accordingly treatment of the strip by forming the conprimarily of greater diameter than due 'prolongation of the treatment, the

. with th diameter of the convolutions to the desired size.-

Anotherfimportant object of my invenis-fto Laccomplish in a unitary operation above helical shaping of the tube, theatera deformation of the strip along the helix, which is ordinarily actreatment of. the strip in a separate Amachine preliminary `to the 'coiling operation, in order to impart to the strip the lateral curvature which has usually con- "st-ituted the p'reparati'on of the strip for its helical formation.

Armor `strips at thei'pres'ent time are of i-i`ubstantial Width and thickness, owing to the requirements of-the fire underwriters.

@and the exigencies, of modern building` which make it necessary that the armor sha-ll possible, bej capable of resisting by nails and other destructive agencies, and siichsubstantial armor strip is vdiiiicult .toy deform laterally, especially when thefstri'pis of Aa more-'or less acutely bent cross section, forl purposes loc l form, these di-iicuities' militating strongly Specification of Letters Patent.

I contemplate the l volution,

of causing interking'of the-convolutions in their, helical Patented May 2, 1916i.

against a ready reduction of the strip to spiral form and desired diameter during the `formation of the first convolution, as has been the practice heretofore in the manufacture of such armor sheathsl Accordingly, my improved method of deforming a strip helically to form a tube comprises the progressive introduction of said strip to a die having a surface constructed and arranged to form said strip into successively narrowing convolutions finally approxiinating the dcsired diameter, said die preferably having a groove with Walls constructed to develop said strip continuously into helical convolutions of relatively large initial diameter respectively, successively upon said convolutions to effect a reduction in diameter extendingv over a plurality of said convolutions and serving to deliver a helix of uniform diameter, smaller than said initial convolution.

Another important object of my invention is to utilize my improved method in the application to an insulated conductor of a strip 1n a helix narrowing progressively from an early convolution to a later conthe completedhelix having a substantially uniform inner diameter approximating the exterior diameter of said article. The apparatus for carrying my improved method into eifect 'will be made the subject of a separate application.

The various features of my invention will be illustrated and described fully in the accompanying drawings and and pointed out in the claim.

In the drawings Figure 1 is a plan view, showing a die by which my improv'ed method may be carried into effect, and in the construction of which my invention has been embodied; and F ig. 2 is a vieivl in cross section of one form of strip in the `treatment of which my improved method and apparatus may be used to advantage, this being the strip shown in Fig. 1. but on a larger scale than in Fig. l.

In the embodiment of my invention selected for illustration and description to enable ready and complete understanding o'f the preferred manner in which my invention' may be carried into effect, the part designated by the reference numeral l is a. die lhaving a forming-surface 2 which in accordance With my invention is larger at specification,

one region than another, and preferably l and /L upon tlie lower i takes the form of :i tapered W i transverse eorruggja'ione in in, 'that upon introduction diei o :L strip 3 of Suitable cross Section` :is for exen'i le duit illustrated in Fig. 2, the strip bein forced continuously by suitable means (not shown, of any character well known to Y'zhose skilled in the :ii-L), tl'irougli e gateway Il, the strip will be @stormed liielically into an initiul convolution corresponding in alleine ter with the li er iliaunete oi' the groove i 2, and :1S tlzel feeding' of 'the .'istrpis'coir tinued, thi iiinl convolution will be ro tilted and inve/il out oif the larger corrugzition e forming groove into snc needing; coi ugg'utione of the groove, its place in the initial rorrugiition being taken by newly formed convolution, und as the Con- Vvolutimisl succ 'ivoly pro rees into nerrower corrisgiitioi l, they r il be con'ipressed und reduced in diameter, in accordance with my invention. Y i

ln the instance illustrated. the 'iexible 'metallic conduit 30, tluiss formed, is of :L uniform .interior diameter approinnitmg.

the exterior dizin'ieter of die hose-pipo for 'which die conduit fo itues ai sheath; i the Strip .muy conveniently lie formed in place surroumling; tie nlu'ted Conductor? und to facilitate @urli ,r1-mation l have shown :in extension of'. tli 'nove 3, this; extension being o?? si., :dile tciitour to ad mit the liosepipc und wide enough 'to receive :it ne r fion odiar, to groove 2 the upturned, ridge or portion 3 of 'tlfy strip 3,

or the sake of I :i d 'to peri'nit "eudj: su", 'fi'. for example, inorizaonnl dive un when the upper perline' illu liz ,it i): suiteli, 4 ing provided. efersibiy 'to insure propel" registration en ilu-'- pui-ts, for which nirpoee l lmic sln'wu i: ridge ll) on the upper part to enter e groove ll on 'tiie lower ger', the upper port f also e to enter ilu; :i 'proper feeding of pliery of the groove ino-role i3 sind le, indicate portions o .'1ingsi.ii'- face on the upper die conN l lie om plementfiry portions o? che 3 parte 13 lo die, i5

:suris' niielljf the formy indicating the region of discharge of the eiinipleteol lieliX.

l'n operation, the part 9 is Closed down upon the part 1, 'ind the strip 3, forced in through tlieglitedvay Ll, enters the groove 2, in which it is coiled readily, owing to the relatively large diameter of the groove at this region, so that both the circular und,

lateral bending strains are accomplished more readily than in apparatus employing the exlsting method, by which the strip 1S reduced at once, in its initial convolution,

to the oeesired diumeter of the helix.

do notI clziinrspecilcally herein ce1'- tuin features which are .inode the subject matter of the claims in my izo-pending applu-,ations Serial Nos. 58al,923; 5842924; .384,925 und 584,927, filed on the same date :is my present application.

.lrieving illustrated and demribedn'iy irrreition thus fully, und suitable 1means for carrying the sume into effect, I wish-it understood that I do not limit myself to the' specific method und materials shown and described by wily of example, no1 in general (lo I limit myself otherwise than as set 'forth in the claim read in Connection with this specification,

vlli/*init l claim :is new7 und desire 'to Se cure by United States'Letters Patent, is:--

` The improved method of deforming; fi strip heli :illy to form a tube luv-Jing' over lapping convolutions; Suid lnetliod oom yprieing the consecutive formation oi? sziid.

A EN A l1" ll/Iolliililltrfll E. 

